Grinding-ring for attrition-mills.



W. VAN NOSTRAND.

GRINDING RING FQR ATTRITION MILLS. APPLICATION FILED JULY 24. I916.

1,226,032. Patented May 15, 1917.

2 SHEETS-SHEET 1- elm-$14M? W: V8172 J oal "rarrzzi Jmmwa I W0WWV54 W. VAN NOSTRAND.

GRINDING RING FOR ATTRITION MILLS.

APPLICATION FILED JULY 24. 1915.

1,226,032. 1 Patented May15,1917.

2 SHEETS-SHEET 2.

w (IllozucqL UNITED s ATEs-PAT OFFICE.

WILLIAM van nosmm, or Demon, NEW YORK. 1

To all whom it may concern: 7

Be it known that I, WILLIAM VA Nos- TRAND, acitizen of the United States, residing at "Dalton, in the county 'of Livingston and State of New York, have invented'certain new and jfuseful Improvements Grinding-Rings for .Attrition-Mills and II do declare'the following to bef afulhxclear,

' same.

My invention relates to. improvements 1n-' and exact description oftheinventi onisuch as will enable others skilled ingtheart to I.

which it appertains to 1 make and usethe grinding mills of' the type known 'to the trade as attrition mills and the object there 7 of is to provide grinding rings of improved construction by whose use no grain will be vdischarged until it has been thoroughly said rings showing more particularlythe unnecessaryamount of the cutting area of p the grinding ribs 7. The ribs 9 of the several pairs 8 are gradually spaced closer together from the inner to. the outer edge por-. tion of the section 2 as clearly shown ground to predetermined mesh or fineness.

With this general object in view the invention resides in certain novel features of construction and in unique combinations of parts to be hereinafter fully described and claimed, thedescriptive matter being supplemented by the accompanying drawings which constitute a and in which: I a

Figure 1 is a vertical section of a mill equipped with the improved rings;

Fig. 2 is an enlarged vertical section of novel arrangement of-the grading ribs; Fig. 3 is a face view of one of the sections of which the grinding ringsare conby heavy lines while the light lines represent one section of the other ring. a

In specifically describing the structure shown in the drawings above briefly described, similar characters will be placed on corresponding parts throughout the several views and references will be herein made to the numerous elements by their respective indices. To this end M designates broadly an attrition mill comprising briefly a grinding chamber C, a supply'hopper H, a passage P for conducting grain from 'said hopper into the chamber C, and a pair of oppositely driven disks D alined axially in .the chamber 0. It is to the inner opposed faces of the disks D that the lmproved grinding rings 1 are secured by bolts or the part of this. application Gamma-nine non hummer-nuns.

' Specification of Letters lalzexit. Patj tedMay 15, 1917, Application flledIu1y-24,'1 916. .Serial No."111,003. l

"SQCtlOIlSDf"b0tll rings are: identical, butone is illustrated;

.The' section2has its'ends 3 cut on sub:

stantially radial-iiflines for some with the ends ofad acent'sections, and the active face .of' said section .is beveled ony'iits inner edge as 'indicated'at 4, this edge being provided with a-gplurality of radially disposed crush- "mg ribs: 51:01 suitable construction. At its outer edge,"the section 2 is provided witha'fini'shing rib 6 extending from one end thereof to the other, while a number of grinding ribs 7 extend on approximately radial lines from the ribs '6 into spaced relation with most ofthe crushing ribs 5, one

of the latter,v however, preferably joining one of theribs 7 as shown. The ribs 7, al-

though being on approximately radial lines, I

are strictly speaking disposed on lines tangent to true radial lines.

A plurality of pairs 8 of gradingribs 9 extend from one end of the section 2 to the other end thereof, the ribs 9 of each pair being flush with the grinding ribs 7 and bemg disposed in staggered relation. The ribs 9 and the finishing rib 6 are preferably beveled as illustrated clearly in Fig. 2 in order toprevent them from occupying an due to the existing space between said ribs finishing ribs 6'- It will thus be seen that as the and the grinding ribs 7,. the crushed grain will be distributed equally between said grinding ribs, the latter exerting shearing cuts on the grain due to the tangential disposition of ribs 7 (see Fig. 4:). When the grain has been sufliciently ground to pass outwardly through the spaces existing between the innermost rows of ribs 9, it will enter the space between these rows and the outer rows, the latter now retaining said grain until it has been ground sufficiently fine to be discharged through the space between the ribs thereof. The ain will now be confined until theribs 7 have finished the grinding operation after which it will be discharged between the finishing ribs 6.

By constructing the device in the manner shown and described, it will be observed that the grinding will be equally distributed throughout the area of the two rings 1 and the outer portions of such rings will not be overcrowded as usual. Furthermore, the rings are divided into a plurality of annular areas each of which grinds the grain to a predetermined degree of fineness before discharging it to the next area. This construction produces much better results than those heretofore gained by similar devices.

In the foregoing I have described certain specific details for illustrative Purposes and inthe accompanying drawings have shown the same but it is to be understood that within the scope of the invention as claimed numerous changes may be made.

I claim:

1. A mill of the class described including a pair of axially alined flat rings each having at its outer edge a continuous finishing rib and having at their inner edges a plurality of crushing ribs, said rings being equippedbetween said crushing and finishing ribs with grinding ribs extending substantially in radial directions, and a plurality of grading ribs extending between the grinding ribs of each ring, and flush with said grinding ribs, the spaces between the grading ribs of one ring and those of the other measured in a radial direction decreasing gradually from the inner to the outer edge portions of said rings, whereby to permit only grain which has been ground to predetermined fineness to travel outwardly toward the finishing ribs to be ultimately discharged therethrough.

2. A'mill of the class described including a pair of axially alined fiat rings each having at its outer edge a continuous finishing rib and having at their inner edges a plurality of crushing ribs, said rings being equipped between said crushing and. finishing ribs with grinding ribs extending sub-' stantially in radial directions, and a plurality of pairs of circumferential rows of grading ribs extending between and flush with the grinding ribs, the ribs of each pair of rows being disposed in staggered relation and the spaces between the ribsof said pairs measured in a radial direction decreasing gradually from the inner toward the outer edge portions of said rings, whereby to ermit only grain which has been groun to predetermined fineness to travel outwardly toward the finishing ribs to be ultimately discharged therethrough.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM VAN NOSTRAND.

Witnesses ALBERT D. GUTMAN, LANNES LYON. 

